Index: modules/awt/src/main/java/common/java/awt/Canvas.java =================================================================== --- modules/awt/src/main/java/common/java/awt/Canvas.java (revision 628717) +++ modules/awt/src/main/java/common/java/awt/Canvas.java (working copy) @@ -119,7 +119,7 @@ public void paint(Graphics g) { toolkit.lockAWT(); try { - // just do nothing + g.clearRect(0, 0, w, h); } finally { toolkit.unlockAWT(); }